package com.heima.wemedia.gateway.filter;

import cn.hutool.core.convert.Convert;
import cn.hutool.core.util.StrUtil;
import com.heima.utils.common.AppJwtUtil;
import com.heima.wemedia.gateway.config.MyConfig;
import io.jsonwebtoken.Claims;
import lombok.extern.slf4j.Slf4j;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.util.AntPathMatcher;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

import javax.annotation.Resource;

@Component
@Slf4j
public class AuthorizeFilter implements Ordered, GlobalFilter {

    @Resource
    private MyConfig myConfig;
    private static final AntPathMatcher pathMatcher = new AntPathMatcher();

    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        //1.获取request和response对象
        ServerHttpRequest request = exchange.getRequest();
        ServerHttpResponse response = exchange.getResponse();

        //2.判断是否是登录或白名单
        for (String noAuthPath : myConfig.getNoAuthPaths()) {
            if (pathMatcher.match(noAuthPath, request.getURI().getPath())) {
                //放行
                return chain.filter(exchange);
            }
        }

        //3.获取token
        String token = request.getHeaders().getFirst("token");

        //4.判断token是否存在
        if (StrUtil.isBlank(token)) {
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }

        //5.判断token是否有效
        try {
            Claims claimsBody = AppJwtUtil.getClaimsBody(token);
            //是否是过期
            int result = AppJwtUtil.verifyToken(claimsBody);
            if (result == 1 || result == 2) {
                response.setStatusCode(HttpStatus.UNAUTHORIZED);
                return response.setComplete();
            }
            //获得token解析后中的用户信息
            Object userId = claimsBody.get("id");
            //在header中添加新的信息，向下游微服务传递
            exchange.getRequest().mutate().header("userId", Convert.toStr(userId));

        } catch (Exception e) {
            e.printStackTrace();
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }

        //6.放行
        return chain.filter(exchange);
    }

    /**
     * 优先级设置  值越小  优先级越高
     *
     * @return
     */
    @Override
    public int getOrder() {
        return Integer.MIN_VALUE;
    }
}
